Top 10 Countries with a Rectangular Shape on the Map

'Rectangularness' of a country is defined as its maximum percentage overlap with a rectangle of the same area (size).
By using an algorithm and shapefiles from Natural Earth it's possible to measure countries for 'rectangularness'.
The Top Ten
1 Egypt Egypt, officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia via a land bridge formed by the Sinai Peninsula. It is bordered by the Mediterranean Sea to the north, the Gaza Strip (Palestine) and Israel to the northeast, ...read more.
2 Sint Maarten

93.7 % of its territory is within a rectangle of the size of Sint Maarten

3 Lesotho Lesotho, officially the Kingdom of Lesotho, is an enclaved, landlocked country in southern Africa completely surrounded by South Africa. It is by far the largest of the world's three independent states completely surrounded by the territory of another country, with Vatican City and San Marino being the other two. Additionally, it is the only such state outside the Italian peninsula, and the only one that is not a microstate. Lesotho is just over 30,000 km2 (11,583 sq mi) and has a population of about 2 million. Its capital and largest city is Maseru. The official languages are Sesotho and English. ...read more.

93.6% of its territory is within a rectangle of the size of Lesotho

4 Yemen Yemen, officially the Republic of Yemen, is a country in Western Asia, on the southern end of the Arabian Peninsula. It borders Saudi Arabia to the north and Oman to the northeast and shares maritime borders with Eritrea, Djibouti, and Somalia. It is the second-largest Arab sovereign state in the peninsula, ...read more.
5 Ghana Ghana, officially called the Republic of Ghana, is a sovereign unitary presidential constitutional democracy, located along the Gulf of Guinea and Atlantic Ocean, in the subregion of West Africa.
6 Macedonia North Macedonia is a landlocked southeastern European country. It borders Greece to the south, Albania to the west, Bulgaria to the east, and Serbia and Kosovo to the north. It has a population of over 2 million people which are a mixture of Macedonians, Albanians, and Serbians. Macedonian is the official language of the country. North Macedonia has many beautiful forests, lakes, and old structures. The capital city is Skopje.
7 Côte d'Ivoire Ivory Coast or Côte d'Ivoire, officially named the Republic of Côte d'Ivoire, is a country located in West Africa.
8 Poland Poland, officially the Republic of Poland, is a country in Central Europe, bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine and Belarus to the east; and the Baltic Sea, Kaliningrad Oblast (a Russian exclave) and Lithuania to the north. With a population of approximately ...read more.
9 Nauru Nauru, officially the Republic of Nauru and formerly known as Pleasant Island, is an island country in Micronesia in the Central Pacific. It's the third smallest country in the world and the least visited country in the world as well. Its nearest neighbour is Banaba Island in Kiribati, 300 km (190 mi) ...read more.
10 Sudan Sudan, officially the Republic of the Sudan, is a country in Northeast Africa. It shares borders with the Central African Republic to the southwest, Chad to the west, Egypt to the north, Eritrea to the northeast, Ethiopia to the southeast, Libya to the northwest, South Sudan to the south and the Red Sea. It has a population of 45.70 million people as of 2022 and occupies 1,886,068 square kilometres, making it Africa's third-largest country by area, and the third-largest by area in the Arab League. It was the largest country by area in Africa and the Arab League until the secession of South Sudan in 2011, since which both titles have been held by Algeria. Its capital is Khartoum and its most ...read more.

'Rectangularness' Index - 0.917 (91.7% of its territory is within a rectangle of the size of Sudan)

The Contenders
11 Turkey Turkey, officially the Republic of Turkey, is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is bordered by eight countries with Greece and Bulgaria to the northwest; Georgia to the northeast; Armenia, ...read more.
12 Libya Libya, officially the State of Libya, is a country in the Maghreb region of North Africa bordered by the Mediterranean Sea to the north, Egypt to the east, Sudan to the southeast, Chad and Niger to the south, and Algeria and Tunisia to the west.
13 Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast; while bordering the Río de la Plata to the south and the Atlantic Ocean to the southeast. It is part of the Southern ...read more.
14 El Salvador El Salvador, officially the Republic of El Salvador, is the smallest and the most densely populated country in Central America.
15 Romania Romania is a sovereign state located in Southeastern Europe It borders the Black Sea, Bulgaria, Ukraine, Hungary, Serbia, and Moldova. It has an area of 238,391 square kilometres and a temperate-continental climate. With over 19 million inhabitants, the country is the seventh-most-populous member state ...read more.
16 Bulgaria Bulgaria, officially the Republic of Bulgaria, was established in 681 ad. and since then it never changed it's name, which makes it one of the oldest countries in Europe. Located in the Balkan Peninsula between Greece, Turkey, Romania, Serbia, Macedonia and Black Sea. The Capital of Bulgaria is Sofia, ...read more.
17 Nepal Nepal, officially the Federal Democratic Republic of Nepal, is a sovereign state located in South Asia. ...read more.
18 Hungary Hungary is a sovereign state in Europe. It is situated in the Carpathian Basin and is bordered by Slovakia to the north, Romania to the east, Serbia to the south, Croatia to the southwest, Slovenia to the west, Austria to the northwest, and Ukraine to the northeast.
19 San Marino San Marino, officially the Republic of San Marino, also known as the Most Serene Republic of San Marino, is an enclaved microstate surrounded by Italy, situated on the Italian Peninsula on the northeastern side of the Apennine Mountains. San Marino covers a land area of just over 61 km2 (24 sq mi), ...read more.
20 Bangladesh Bangladesh, officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 163 million people in an area of either 148,460 square kilometres (57,320 sq mi) or 147,570 square kilometres (56,980 sq mi), making ...read more.
21 Swaziland Eswatini, officially the Kingdom of Eswatini and formerly named Swaziland (officially renamed in 2018), is a landlocked country in Southern Africa. It is bordered by Mozambique to its northeast and South Africa to its north, west, south, and southeast. At no more than 200 kilometres (120 mi) north to ...read more.
22 Sierra Leone
23 Angola
24 Equatorial Guinea Equatorial Guinea, officially the Republic of Equatorial Guinea, is a country located in Central Africa, with an area of 28,000 square kilometres (11,000 sq mi). Formerly the colony of Spanish Guinea, its post-independence name evokes its location near both the Equator and the Gulf of Guinea. As of ...read more.
25 Tanzania Tanzania, officially the United Republic of Tanzania or simply U.R.T, is a large country in Eastern Africa within the African Great Lakes region.
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